Leaders have the option of trusting subordinates, then operating at a higher level. However part of the job of a leader is to decide who to trust, with what. And why.
Sometimes that means, "Trust, but verify." The leader will spot check randomly to see that the whole is good.
Often, as here, that means, "Trust in some things, but not others." The leader in this case trusted the technical person to produce an accurate description of what happened. But didn't trust that same person to arrive at a solution that met the business of having a similar disaster not happen the next time.
But rather than undermine the tech person with, "I don't trust you to meet the business need," the leader communicated it with, "I trust you on the technical details, but here is the expectation for what you need to produce."